Rare earth red pigment and preparation method thereof

[0028] The embodiment of the present invention also relates to the preparation method of the above-mentioned rare earth red pigment, comprising the following steps:

[0029] (1) dissolving the soluble rare earth salt, soluble iron salt and soluble aluminum salt in water, adding a precipitating agent under stirring conditions, and standing still after stirring to obtain a suspension;

[0030] In one embodiment of the present invention, the stirring reaction time is 10-30 minutes, and the standing time is 1-3 hours. In order to completely precipitate the ions in the soluble metal salt, an excess amount of precipitant should be added in this step.

[0031] (2) solid-liquid separation is carried out to the suspension, and the solid phase is washed and dried to obtain a precipitate;

[0032] In one embodiment of the present invention, after the suspension is suction-filtered under reduced pressure, the obtained solid phase is washed with deionized water, ethanol, and deionized water

[0035] Example 1

[0036] A red pigment doped with rare earth ions. The raw materials include, by weight, 5 parts of cerium nitrate, 30 parts of iron nitrate, 10 parts of aluminum nitrate and 30 parts of sodium hydroxide.

[0037] The rare earth red pigment is prepared by a liquid phase method, which specifically includes the following steps:

[0038] (1) dissolving cerium nitrate, ferric nitrate and aluminum nitrate in water, adding sodium hydroxide under stirring condition, stirring and reacting for 15 minutes and then standing for 2 hours to obtain a suspension;

[0039] (2) After the suspension is filtered under reduced pressure, the obtained solid phase is washed with deionized water, ethanol, and deionized water successively, and then vacuum-dried and ground to obtain a precipitate;

[0040] (3) calcining the precipitate at 800° C. for 60 min to obtain the rare earth red pigment.

[0041] The raw material components and calcination conditions in Examples 2-4 and Comparati